/*
 * JaLingo, http://jalingo.sourceforge.net/
 *
 * Copyright (c) 2002-2006 Oleksandr Shyshko
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package ja.lingo.application.util.messages;

import ja.centre.util.io.Files;
import ja.lingo.engine.util.EngineFiles;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.text.SimpleDateFormat;
import java.util.Date;

class ErrorDumper {
    private static final Log LOG = LogFactory.getLog(ErrorDumper.class);

    private static final SimpleDateFormat FILE_NAME_FORMAT = new SimpleDateFormat("'jalingo-error-'yyyyMMdd-HHmmss'.log'");

    private ErrorDumper() {
    }

    public static String dump(Throwable t) {
        LOG.error("Internal error occured", t);

        String fileName = EngineFiles.calculateInWorking("log");

        try {
            Files.ensureDirectoryExists(fileName);
        } catch (IOException e) {
            log(fileName, e, t);
        }
        fileName = new File(fileName, FILE_NAME_FORMAT.format(new Date())).toString();

        PrintStream ps = null;
        try {
            ps = new PrintStream(new FileOutputStream(fileName));
            ps.println("JaLingo Internal Error Log");
            ps.println("==========================");
            ps.println("Exception: ...");
            t.printStackTrace(ps);
        } catch (IOException e) {
            log(fileName, e, t);
        } finally {
            if (ps != null) {
                ps.close();
            }
        }

        return fileName;
    }

    private static void log(String fileName, IOException e, Throwable t) {
        LOG.error("Could not save internal error to file \"" + fileName + "\"", e);
        LOG.error("Unsaved internal error", t);
    }

    public static void main(String[] args) {
        dump(new Throwable());
    }
}
